Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.
Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan.
Appl Ergon. 2018 Apr;68:204-212. doi: 10.1016/j.apergo.2017.11.016. Epub 2017 Dec 6.
A head-mounted display (HMD) with inappropriate mass and center of mass (COM) increases the physical workload of HMD users. The aim of this study was to investigate the effects of mass and COM of HMD on physical workload. Twelve subjects participated in this study. The mass and posteroanterior COM position were 0.8, 1.2, or 1.6 kg and -7.0, 0.0, or 7.0 cm, respectively. The subjects gazed at the target objects in four test postures: the neutral, look-up, body-bending, and look-down postures. The normalized joint torques for the neck and the lumbar region were calculated based on the measured segment angles. The results showed that the neck joint torque was significantly affected by mass and COM and it increased as the HMD mass increased for all test postures. The COM position that minimized the neck joint torque varied depending on the test postures, and the recommended ranges of COM were identified.
头戴式显示器（HMD）的质量和质心（COM）不合适会增加 HMD 用户的体力负荷。本研究旨在探讨 HMD 质量和 COM 对体力负荷的影响。12 名受试者参加了这项研究。HMD 的质量和前后向 COM 位置分别为 0.8、1.2 或 1.6 千克和-7.0、0.0 或 7.0 厘米。受试者在四种测试姿势下注视目标物体：中立、抬头、弯腰和低头姿势。根据测量的节段角度计算颈部和腰部的归一化关节扭矩。结果表明，颈部关节扭矩受质量和 COM 的显著影响，对于所有测试姿势，颈部关节扭矩随 HMD 质量的增加而增加。最小化颈部关节扭矩的 COM 位置取决于测试姿势，并且确定了 COM 的推荐范围。
